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I think now days your production number would be the last 5 digits of your VIN, not the last 4, for the year of production (2012). The year 2012 is designated by the letter C in the VIN.

I also understand the VIN is assigned when the body enters the paint department, which often is not exactly the final order the Volts come off the assembly line. The VIN is probably assigned at this point so all the component parts can be stamped with the same VIN.

If you follow the links in my signature below you can find a complete description on how to decrypt the VIN.

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I also understand the VIN is assigned when the body enters the paint department, which often is not exactly the final order the Volts come off the assembly line.

My understanding is the numeric portion is assigned when the body exits the paint shop, not enters it. But that's probably a quibble.

Not all components of the VIN are complete when the number is assigned. Options such as the premium interior and navigation also affect the final full VIN, and are added in later as the car is assembled.

So, how can I figure out what my Volt's production sequence number is over the entire production run for 2011-2012 up to that point? I have a 2012 with last five VIN numbers: 01728.

I don't know that we know that exactly. As was pointed out further up the thread VINs don't necessarily exit the production line in exact order. For a rough idea, though, you should be able to add the 2011 VINs onto the front of the 2012. I know there's at least 3961 2011 VINs assigned (we have car B3961 on voltstats.net, as the highest 2011 VIN participating.)

I'm not sure if that's the last 2011 or not, though (maybe someone here knows for sure?)

I ordered my 2012 Volt on 15 Oct, it went into production on 14 Nov, and I took delivery on 13 Dec 2011. My VIN contains "...CU110127" at the end. So the C means 2012, and it's the 10,127th (roughly) 2012 Volt produced in this model year? Seems a little high.